American Airlines yesterday released an internal memo in which they comment on a April 20 incident that involved an AA flight that took off from Dallas, promptly lost a “large panel” on the underside of the plane during its initial ascent, and proceeded all the way to Paris, despite both the captain and crew confirming that they knew something was amiss.

Just what was wrong the crew didn’t seem to know until touching down in Paris. And it doesn’t seem that passengers were aware that anything was unusual. Several crew members managed to snap photos of the missing panel after landing, and circulated the shots in e-mails. The photos were attached to the internal member that CNN managed to obtain.

The company issued the statement after receiving upset e-mails from passengers, who stumbled upon pictures of the missing panel on the Internet.